Hot-top for molds.



C. E. DUNCAN.

HOT TOP FOR MOLDS.

Patented Aug. 7, 1917.

certain improvements in CHARLES E. DUNCAN, OF BUFFALO, NEW YORK.

HOT-TOP FOR MOLDS.

Specification of Letters Patent.

Patented Aug. 7, 1917.

Application filed November 25, 1916. Serial No. 133,346.

To all whom it may concern:

Be it known that I, CHARLES E. DUNCAN, residing at Buffalo, in the county of Erie 'and State of New York, a citizen of the United States, have invented or discovered certain new and useful Improvements in Hot-Tops for Molds, of which improvement the following is a specification.

The invention described herein relates to what is known as hot top for ingot molds. These devices are adapted to be placed on ingot or other molds prior to turning the metal into the mold, for the purpose of providing a reservoir of molten metal to compensate for the shrinkage or contraction of the metal in the mold proper. The object of the invention described, is to provide for the easy renewal of the parts of the hot top, which are rapidly destroyed by the action of the molten metal flowing therethrough. The invention is hereinafter more fully described and claimed,

In the accompanying drawing forming a part of this specification, Figure 1 is a top plan view of a hot top embodying the improvements described herein, and Fig. 2 is a sectional view of the same.

In the practice of the invention, the inclosing or retaining frame is made of cast iron and steel and consists of a plurality of sections 1, the number of such sections being dependent upon the transverse shape or outline, it being the purpose of the invention to so construct'the frame, that the sections may clamp the refractory lining in position. When 'a polygonal frame is desired, it is made in as many sections as there are angles, each section including one of the angles. At their ends the sections are provided with flanges 2, through which are passed bolts 3, for drawing the sections together. On their inner faces, the sections are provided with shoulders 4, on which the lining is supported, and the flanges 5 adapted to project over the upper edge of the lining. It is preferred to so construct and proportion the frame, that ordinary fire-brick 6, may be employed as the linin As shown, the shoulders 4 am? the flanges 5 are spaced a distance apart equal to the length of the brick, so that they can be easily withdrawn and new brick inserted. When it is desired to renew the lining, the

nuts on the bolt 3 are slackened ofl' suiliciently to relieve the edgewise pressure thereon, thus permitting of the withdrawal of the old worn brick, new brick are then placed in position and the nuts tightened up causing the frame sections to exert such edgewise pressure on the bricks as to hold them in position.

I claim herein as my invention:

1. A hot top for molds having in combination a frame formed in sections, and

provided with an inwardly projecting shoulder and flange suitably spaced relative to the form of lining material .to be employed, a lining formed in sections, and means for drawing the sections of the frame together to exert a clamping pressure on the lining sections.

2. A hot top for molds having in combination, a polygonal frame formed in sections, each section containing an angle, the several sections being provided with in war dly projecting supporting shoulders and retaining flanges, the shoulders and flanges being spaced distances apart substantially equal to the length of the lining sections, a lining formed in sections and means for drawing the frame sections together to clamp the lining sections in position.

In testimony whereof, I have hereunto set my hand. I

CHARLES E. DUNCAN.

Witnesses:

G. P. AMsnEN, E. M. Hunm. 

